Muffler.



L. H. BRHJKMAN.

MUFFLER.

APPLICATION FILED JAN. .1, 1913.

1,302,300. Patented Apr. 29, 1919.

WITNESSES f 'alyvzgzlk .4 TTORNEY UNITED STATES PATENT OFFICE.

LOUIS H. 3mm, OF GLEN RIDGE, NEW JERSEY, ASSIGN'OB TO TITEFLEX METALHOSE CORPORATION, A CORPORATION OF NEW YORK.

5 New Jersey, have invented certain new and useful Improvements inMufilers, of which the following is a specification.

The present invention relates to mufilersor sound'silencers, and whileits principal use will be with internal combustion and steam-engines, itmay be used for other purposes.

Complicated and expensive apparatus has been suggested heretoforeas ameans of reducing the noise of the exhaust without greatly increasingthe back-pressure of the engine.

For this purpose devices have been proposed for giving the products ofcombustion certain complex paths to accomplish the result of silencingnoise and without greatly increasing the back-pressure of the engine.These devices consist of a great number of parts placed in specialcontainers, thus making them objectionable on account of the cost ofproduction, the difiiculties in assembling and adjustment, and theirtendency to become deranged due, among other things, to the vibration ofthe engines. Furthermore, such devices do not properly cool the exhaustgases before permitting them to escape into the atmosphere. Their use onautomobiles is unsatisfactory on account of the hard usage inherent inthis class of vehicle, and, also, due to the relative movement of theengine and the point or points of support of the muflier. The abovecauses also combine to materially shorten the life of the mufiielsheretofore devised.

One object of the invention is to provide a mufiler which whenconstructed in accordance with the best form of my invention, will notonly deaden the noise of the exhaust to a minimum without materiallyincreasing the back pressure of the engine, and which is extremelysimple, efficient and inexpensive, but also in which the exhaust are socooled on their way therethrough and their pressure so reduced thatthere is no ganger of the gases exploding in the muf- Further objects,features and advantages will. more clearly appear from the detaileddescription -given: below taken in connecform a part of thisspecification.

Patented Apr. 29, 1919.

Application filed January 17, 1913. Serial No. 742,570.

" norms.

1,302,300, Specification of Letters Patent.

To all whom it may concern:

tion with the accompanying drawings which In the drawings,

Figure 1 illustrates an automobile wi my invention in one form, attachedthereto;

Fig. 3 is an enlarged view of the end of the mufiier shown in Fig. l,partly in section; and

Figs. 2 and 4 are similar views of modified forms of mufllers.

As shown in Figs. 1 and 3 the mufller comprises a single continuousmetal conduit in the form of a tube 2, which is directly connected tothe engine exhaust port 1 so that the exhaust gases will passtherethrough. The tube or conduit 2 is spirally corrugated, thecorrugations extending substantially from the exhaust port at the engineto'the end of the muflier where the tube is supported from the rear axleor frame mobile, as by bracket 7. A plug 3 is inserted in the outer endof the conduit and through the plug 3 extends a short tube 4 tapered onits inner end, and this inner end having perforations 5 therein throughwhich the exhaust gases escape from the conduit 2 to the atmospherethrough the tube 4. By corrugating the tube 2, folds Gare formed at anangle to the axis of the conduit which being spiral in formation give tothe exhaust gases as they pass therethrough, a circular or spiral motionso that the sound of the exhaust is deadened. -Because of this spiral orcircular motion and the fact that the muffler consists primarily of aunitary conduit whereby the exhaust gases are only separated from theatmosphere by a thin metallic wall, the gases are quickly cooled. Thiscooling not only tends to decrease the back pressure but prevents thegases from exploding in the mufiler or exhaust chambers of the engine.It is desirable'to check more or less the circular motion of the gasesbefore 'they leave the mufiler and this is acof the auto-Q,

in the tube 11 so as to hold the latter in place and prevent it frombeing forced outwardly by the exhaust gases. The outer end of the tube11 is plugged up by plug 14 so that the gases are obstructed and causedto pass between the two tubes and outside of the inner tube. The spiralcorrugations of the tubes 2 and 11 run in opposite directions so that asthe gases pass between them the spiral motion of the gases produced bycorrugations 6 is opposed, whereby the gases leave the muflier morenearly in a straight lin %y the above arrangements the products ofcombustion from the exhaust ports of the engine enter the corrugatedconduit, and as a result of the corrugations 6-6 they are given awhirling movement, thereby decreasing their linear velocity and theoutside surfaces of the corrugations being exposed, the dissipation ofheat therefrom causes a rapid cooling of the hot gases. therebydecreasing their volume and consequently the noise of the exhaust.

The corrugated conduit may extend directly from the exhaust ports of theengine to the end of the muflier, or it may compose any portion of thispath, depending upon the conditions in any case.

From the above it will be clear that not only is the muflier simple,eflicient and inexpensive, but the same is composed of principally asingle unitary conduit which not only deadens the noise, but rapidlycools the exhaust gases. The muflier may easily be attached directly tothe exhaust ports of the engine, its low cost permitting of the doingaway with intermediate connections. Furthermore, the muflier beingflexible it will not be damaged, due to relative movement of the engineand those parts to which the outer end of the mufiler is connected. Thisflexibility also permits of the muflier being easily bent to accommodateits position to other parts of the vehicle, etc., to which it isapplied.

Although I have described my improvements in great detail and withrespect to one particular embodiment thereof, nevertheless I do notdesire to be limited to such details except as clearly specified in theappended claims, since many changes and modifications may well be madewithout departing from the spirit and scope of my invention in itsbroader aspects.

Having thus fully and clearly described my improvements, what I claim asnew and desire to sccure'by Letters Patent, is:

1. A muilier for internal combustion engines, comprising a singleflexible spirally corrugated conduit extending from the ex- 3. A mufilercomprising a flexible con duit through which the exhaust gases flow,said conduit being unobstructed t rough its main portion and having aspirally corrugated passage to deaden the noise of the exhaust, andmeans in the outer end thereof tending to obstruct the flow of ases.

4. A muflier comprising a con uit through which the exhaust gases flow,said conduit having spiral corrugations-therein to give the exhaustgases a spiral motion, and means in the outer end thereof tending toobstruct the flow of gases thereby.

5. A mufiier comprising a conduit having a plurality of folds thereinadapted to produce a circular motion of the exhaust gases, and means atthe end of the conduit acting to oppose said spiral motion of the gases.

6. A muflier comprising a conduit having spiral corrugations in the wallthereof to produce a spiral motion of the gases passing therethrough,and means at the outer end of the conduit acting to oppose said spiralmotion.

7. A mufiier comprising a spirally corrugated tube having a spirallycorru ted tube of lesser diameter in its outer en the spirals of theinner tube running in the opposite direction to those of the outer tube,whereby the spiral motion set in the exhaust gases by the outer tube isopposed as the gases issue from the muflier.

8. A muflier comprising a conduit having an unobstructed passage throughthe main portion thereof and having corrugations, through which theexhaust gases are adapted to flow, the outside surfaces of thecorrugations being exposed to the atmosphere to increase the dissipationof heat therefrom and thereby cool the exhaust gases to decrease theirvolume and consequently the 110158.

9. A muflier comprising a conduit having an unobstructed passage throughthe main portion thereof and having spiral corr ations for giving theexhaust gases passing therethroufgh a spiral motion, the outsidesurfaces 0 the corrugations being exposed to the atmosphere to increasethe dissipation of heat therefrom and thereby cool the exha-ust gases todecrease their volume and consequently the noise.

10. A muflier comprising a flexible conduit' having an unobstructedpassage through the main portion thereof and having spiral corrugationsfor giving the exhaust gases passmg therethrou h a spiral motion, theoutside surfaces 0 the corrugations being exposed to theatmosphere toincrease the dissipation of heat therefrom and thereby cool the exhaustgases to decrease their volume and consequently the noise, and means inthe outer end of the conduit tending to obstruct the flow of gasestherefrom.

In testimony whereof, I have signed my name to this specification, inthe presence of two subscribin witnesses.

L UIS H. BRINKMAN.

Witnesses:

Gonnsm CROSBY, Enwm Seem.

